Fix dependency breakage for pyproto in PyAuto.
Fix dependency breakage for pyproto in PyAuto.

This was introduced by http://codereview.chromium.org/9315035

BUG=chromium-os:26220
TEST=None

Change-Id: I90122c42b4e66c19d7d02032a76548d9d4fc2459

Review URL: https://chromiumcodereview.appspot.com/9389023

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@121765 0039d316-1c4b-4281-b951-d872f2087c98

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